TREATMENT OF SLUDGE CONTAINING BLAST FURNACE WATER SLAG IN ACTIVATED SLUDGE TREATMENT

Title:

TREATMENT OF SLUDGE CONTAINING BLAST FURNACE WATER SLAG IN ACTIVATED SLUDGE TREATMENT

Document Type and Number:

Japanese Patent JPH06170398

Kind Code:

A

Abstract:

PURPOSE: To recover blast furnace water slag with high efficiency by a liquid cyclone and to efficiently dehydrate excessive sludge obtained as the overflow mixed soln. of the liquid cyclone in the activated sludge treatment of sewage using blast furnace water slag as a fixing carrier of activated sludge.

CONSTITUTION: When blast furnace water slag is recovered from the sludge mixed soln. containing blast furnace water slag drawn out of a sludge sedimentation tank, the ratio (Du/Do) of the lower nozzle diameter (Du) and upper nozzle diameter (Do) of the liquid cyclone is set to 0.8-1.2. With respect to an overflow mixed soln. containing blast furnace water slag, 2-4wt.% of ferric chloride and 2-6wt.% of calcium hydroxide are added to the overflow mixed soln. with respect to the solid of the mixed soln.

Inventors:

FUJII MASAHIRO
MIKI OSAMU
KAMORI YASUSHI

Application Number:

JP35213592A

Publication Date:

June 21, 1994

Filing Date:

December 10, 1992

Export Citation:

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Assignee:

NIPPON STEEL CORP

International Classes:

B04C5/00; C02F3/08; C02F11/00; C02F11/02; C02F11/12; C02F11/14; (IPC1-7): C02F11/12; B04C5/00; C02F3/08; C02F11/00; C02F11/02; C02F11/14

Domestic Patent References:

JPH047094A	1992-01-10
JPS52155854A	1977-12-24
JPS5019852A	1975-03-03

Attorney, Agent or Firm:

Katsuo Naruse (1 person outside)

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